feat: 优化 chat-engine.ts 中的消息流处理逻辑

server/service/agent/chat-engine.ts

@@ -506,6 +506,9 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
   let streamedReasoning = "";
   let streamedToolCalls: Array<Record<string, unknown>> = [];
   let chunkPartId = 0;
+  let streamedParts: Array<Record<string, unknown>> = [];
+  let activeTextPartIdx = -1;
+  let activeReasoningPartIdx = -1;
 
   params.onClientClose?.(() => {
     if (!serverAbortController.signal.aborted) {
@@ -561,8 +564,39 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
     onChunk: ({ chunk }) => {
       if (chunk.type === "text-delta") {
         streamedText += chunk.text;
+        if (activeTextPartIdx < 0) {
+          activeTextPartIdx = streamedParts.length;
+          streamedParts.push({ id: `p_${chunkPartId++}`, type: "text", text: "" });
+        }
+        const tp = streamedParts[activeTextPartIdx] as Record<string, unknown>;
+        tp.text = ((tp.text as string) || "") + chunk.text;
+      } else if (chunk.type === "text-start") {
+        activeTextPartIdx = streamedParts.length;
+        streamedParts.push({ id: `p_${chunkPartId++}`, type: "text", text: "" });
+      } else if (chunk.type === "text-end") {
+        activeTextPartIdx = -1;
       } else if (chunk.type === "reasoning-delta") {
         streamedReasoning += chunk.text;
+        if (activeReasoningPartIdx < 0) {
+          activeReasoningPartIdx = streamedParts.length;
+          streamedParts.push({ id: `p_${chunkPartId++}`, type: "reasoning", text: "" });
+        }
+        const rp = streamedParts[activeReasoningPartIdx] as Record<string, unknown>;
+        rp.text = ((rp.text as string) || "") + chunk.text;
+      } else if (chunk.type === "reasoning-start") {
+        activeReasoningPartIdx = streamedParts.length;
+        streamedParts.push({ id: `p_${chunkPartId++}`, type: "reasoning", text: "" });
+      } else if (chunk.type === "reasoning-end") {
+        activeReasoningPartIdx = -1;
+      } else if (chunk.type === "tool-input-start") {
+        streamedParts.push({
+          id: `p_${chunkPartId++}`,
+          type: "tool-call",
+          toolCallId: chunk.id,
+          toolName: chunk.toolName,
+          args: undefined,
+          state: "preparing",
+        });
       } else if (chunk.type === "tool-call") {
         streamedToolCalls.push({
           id: `p_${chunkPartId++}`,
@@ -572,6 +606,22 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
           args: chunk.input,
           state: "call",
         });
+        const existing = streamedParts.find(
+          (p) => p.type === "tool-call" && p.toolCallId === chunk.toolCallId,
+        );
+        if (existing) {
+          existing.args = chunk.input;
+          existing.state = "call";
+        } else {
+          streamedParts.push({
+            id: `p_${chunkPartId++}`,
+            type: "tool-call",
+            toolCallId: chunk.toolCallId,
+            toolName: chunk.toolName,
+            args: chunk.input,
+            state: "call",
+          });
+        }
       } else if (chunk.type === "tool-result") {
         const tcIdx = streamedToolCalls.findIndex((tc) => tc.toolCallId === chunk.toolCallId);
         const tcEntry = tcIdx >= 0 ? streamedToolCalls[tcIdx] : undefined;
@@ -579,6 +629,13 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
           tcEntry.result = chunk.output;
           tcEntry.state = "result";
         }
+        const part = streamedParts.find(
+          (p) => p.type === "tool-call" && p.toolCallId === chunk.toolCallId,
+        );
+        if (part) {
+          part.result = chunk.output;
+          part.state = "result";
+        }
       }
     },
     onFinish: async ({ finishReason, usage, steps, text: assistantText }) => {
@@ -602,6 +659,12 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
         for (const step of steps) {
           const toolResultMap = new Map(step.toolResults.map((tr) => [tr.toolCallId, tr.output]));
           const contentArr = step.content as Array<Record<string, unknown>>;
+          logger.info(
+            "[%s] [CHAT-ENGINE] step %d content order: %s",
+            requestId,
+            step.stepNumber,
+            contentArr.map((cp) => cp.type + (cp.type === "tool-call" ? `(${(cp as any).toolName})` : "")).join(" → "),
+          );
           const approvalToolCallIds = new Set<string>();
           for (const cp of contentArr) {
             if (cp.type === "tool-approval-request" && (cp as any).approvalId && (cp as any).toolCall) {
@@ -746,33 +809,21 @@ export async function executeChat(params: ChatEngineParams): Promise<ChatEngineR
         const partialText = streamedText;
         logger.info("[%s] [CHAT-ENGINE] aborted: streamedTextLen=%d streamedToolCalls=%d", requestId, partialText.length, streamedToolCalls.length);
 
-        const parts: Array<Record<string, unknown>> = [];
-        let hasTextPart = false;
-        if (streamedReasoning.trim()) {
-          parts.push({ id: `p_${parts.length}`, type: "reasoning", text: streamedReasoning });
-        }
-        if (partialText.trim()) {
-          parts.push({ id: `p_${parts.length}`, type: "text", text: partialText });
-          hasTextPart = true;
-        }
-        for (const tc of streamedToolCalls) {
-          parts.push({
-            id: `p_${parts.length}`,
-            type: "tool-call",
-            toolCallId: tc.toolCallId,
-            toolName: tc.toolName,
-            args: tc.args,
-            result: tc.result,
-            state: tc.result !== undefined ? "result" : "call",
-          });
-        }
-
+        const parts: Array<Record<string, unknown>> = streamedParts
+          .filter((p) => {
+            if (p.type === "text") return ((p.text as string) || "").trim().length > 0;
+            if (p.type === "reasoning") return ((p.text as string) || "").trim().length > 0;
+            return true;
+          })
+          .map((p, i) => ({ ...p, id: `p_${i}` }));
+        let hasTextPart = parts.some((p) => p.type === "text");
         const hasToolCallPart = parts.some((p) => p.type === "tool-call");
         let finalText = partialText;
         if (!hasTextPart && hasToolCallPart) {
           const noticeText = "（对话已停止，以上是已完成的工具调用记录。）";
           parts.push({ id: `p_${parts.length}`, type: "text", text: noticeText });
           finalText = (finalText || "") + noticeText;
+          hasTextPart = true;
           logger.info("[%s] [CHAT-ENGINE] aborted with tool calls but no text, appended notice", requestId);
         }